Paper-bag machine.



J. DUVALL. PAPER BAG MACHI NE. APPLICATIO N FILED MAY 3!. 1916.

Mtemted Dee. 11, 19W.

l/V,VE/VTOR &Vmw BY A TTOH/VEV [aura/51959: w. 52 W GM 7? v -J. UUVALL'.

PAPER BAG MACHINE. APPLICATION HLED. MAY 31. 1916.

Patented Dee. 11,1917".

2 SHEETS-SHEET2 WIT/VESSES' 45. frame: itself will besimplified. Alldanger feet accessibility when it isdesiredto ad- 'jnst or sharpen it or the former and the former knife. In .conjunctionwith the cut- JAMES DUVALII, on crimes, wasmreron.

learns-nee nacnmn specification of Letters ret eat:

ratenrednea n, re n;

Application filed may 31, 19in. Serial No: meson.

chines whereina width of paper is foldedlongitudinally into a continuous tube from which the bags are made and has for its principal object an improved method of severing this paper tube into blanks at-proper intervals. In most, of the bag machines n common use a striker arm revolves; for thlS purpose whose path is outside of the frame of the: machine, thus taking up much more floor space than necessary and adding a danger element to the machinewhich calls IEO]? a guardthat takes up more space. The Irlost serious objection however to the usual typeof cut-offis the necessity of? altering th ertension on the tube justasit is to be severed. The tube must be slacked up for an instant, which is done by pinch rolls traveling slower than the draw rolls which feed the tube to the machine. This slacking up movement for the purpose of severance isa-source of much trouble, not only limiting the speed at which the bag machine can be run, but unless the adjustments are very carefully made and maintained, the tube is torn or mutilated and the machine plugged, resulting in much loss of time and product. .overcomingthese defects 1 have designed ai'strikerarm movement which travels in the path of the paper tube, who-l ly inside of the frame of the bag. machine and no slacking ofthetube is necessary to its successful operation, tl-ruseliminating the probability of plugging. The striker arm beingkwholly inside the frame,- a bag machine so eqnipped will take up about twenty-five percent. less floor spacevand the construction of the from a swinging arm outside the frame and necessity for a guard is removed. I have also; provided a swingingmeans for holding the top bed knife admitting of peroti arm, delivery rolls have been given an intermittent movement which :lnepsthe tension onrthetubeuniform at the time of .7 and 8', which have the same-peripheral severance. By omitting the usual pinch rolls driven at half speed I- have simplified the machine very mater-ially,which enables it to be run at aniinorea'sed speed.

, y The accompanying drawings show only so much o'fthe bag. machine as is necessary to a full and exact descriptionof my improvements Figure 1 is a plan; Fig. 2 is aside elevation. Fig. 3- shows i i-perspective the delivery rolls 7 and 8, with ac- 'tuating. and rollers 2 and3 of top 'r-oll.

Fig. 4 is a plan ofca-m; 21 Fig, 5 isaside view of same showing the two dislrs cornpo sing cam 2, which allows adjustment. Fig. 6 is side 'elevation ofcut-oif gear bracket 30, showing. eccentric bushing 27. Fig; 7 shows diagrammatically inside elevation allth-at is necessary to follow the passage of the paper tube through the, machine in itsr'elation to; the cut-elf mechanism.

,The paper tube, folded longitudinally around former 20,is fedt'o the machine by the draw rolls QS-and 24, Figs2 and '7. The topside of the bag ison top ofthe former and passes-under bed knife 19 the underside of the bagis underneath the former" and passes underneath theserrated forward edge of theformer which is tar-nee the former knife: As the tube advancesit: passes onto the lower guidetable lland'the upper guide fingerslQanldlii, Fig. 2 -.rest firmly on the top side of thetube and preventit from raising up too muchawhen struck by thecut-oif bar 16: on its: up stroke, They alsolact as guides to insure the alinementyofthetube. Thedraw rolls 23 ands2 l feedthe tubeeou tinuously andthe forwardend of the tubeis engaged by the delivery or pinch? rolls speed as the draw rolls 23- and 24: This keeps the tension on the tube uniform and there is no slacking of the tube to facilitate itssev'erance the tube being held taut at all times. When the proper length of tube has passed through themachineas described, the forward end beingengaged by pinch rolls 7 and 8, the tube" is s'evered by the strikerfbar 16,@1 igsi l and 7, ,movingupward and sharply forcingthe bottom top? sides: oft-he tube against the serrated k'nives-"20'and 19 respectively. The severed forward section v of; the; tube is immediately forwarded by pinch rolls 7-fand 8 to the nip between bottom forming rolle 1 and 28, which have ahigher peripheralspeed th an rolls 7 8, 28-and24w Just-astherolls-l and;

frame and tothe top roll 7 tends :to pull the pinjc'hrolls together whenever the cam is inoperative, as when the roller 3 1s 1n recess 9 of earn 2. His apparent that the striker or cut-off arm'16 must'get belowthe level of the' 'oncoming tube before-it "reaches the nip of rolls 7 'and'8, and toaccomplish this, in the arrangement set forth in the drawings, 1 have shown two scroll gears 14 and. 15,

'- which impart a fast and a slow movement to 'thearm 16 through one revolution; In Fig.

-7 the largediameter of driving scroll gear 15 is-shownin engagement with small diameter of driven seroll gear 14:, to-which the striker bar islattached,just before the bar in its upward movement, is forced against the paper tube. fastest movement ust at the time of severing This gives the bar 16 its the tube and the movement of the bar continues to be rapid while it is above the level of the tube, then it slows down while underneath, the small diameter of the driving "scroll gear 15 being in engagement with the large diameter of the cutoff gear 14; This gives the tube time to pass over to the pinch rolls 7 and8. Just beforethe' striker reaches :the tube on its upstroke, the speed increases and the tube is severed while the bar is mov- *ingrapidly.- W hilethis type ofgear is'useful for somelengths and'weights of bags,

especially those made of-heavvweight paper, plain spurgears will work equally well with others and are to be preferred when the adjustments'can bemadeto use them.

' It will be noted that this striker bar 16 rotates wholly inside .of the frame of the machine and that'it travels in the pathof the paper tube and with it, severing the blank 1 while moving with the paper tube, and thus 'not subjecting it to the shock of striking.

' against the direction of travel which-is the usual wayand which necessitates slacking the tube before it oan'rbe-properly out and cleanly severed. A means must be provided for taking up the wear of the cut off gears let'and 15 so that they may be maintained in perfect mesh to avoi'd'any back lash; The gear 14 carrymgthe'strrker bar 16. 1s journaled in an eccentric bushing 27, F 1g. 6, in

gear bracket '30.. When the gears need adjustment -lock nut-38 is unscrewed, releas- 'i ng bushing 27,- which 'is turned 'until the 'wear is'tak'en up and then the locking'device is'tightened. which holds the. bushing and K i gear 14 firmly in placer A very valuablefeature is to be found in the -means for raising thei bed knife 19.

.Usually this cutting blade is rigidly aliixcd so that it is a matter of serious delay to get at it for repairs or to remove it in order to examine and repair the former knife 20 underneath it. The bed knife 19 is firmly attached to a holder with arms 17 and 18, Fig. 1, which are mounted on shaft 32, the ends of which rest in the split clamp bearings 21 and 22. The knife 19 is brought into its proper position and then the clamps 21 and22 are tightened so that arms 17 and 18 are held firmly in place. When it is desired to examine or repair either bed knife '19 or former knife 20, the clamps 21 and 22 'are loosened sufficiently and the bed knife swung upward out of the way and the necessary repairs made with the least possible delay.

In addition to the top guide fingers 12 and 13 and bottom guide plate 11, Fig. 1, it is often necessary to adjust the pinehrolls 7 and 8 so that the severed blank will feed properly'to the cylinder section or bottom forming-rolls 1 and 28. To effect this the bottom pinch roll 8 is mounted in adjustable journals go that its face may be skewed lightly out of alinement with the top roll 7 either forward or back, dependent upon the direction in which it is desired to guide the paper tube. In Figs. 3, 4.- and 5 it is apparent how the action of the cam 2 on the roller 3 may be varied in time by adjusting the disks composing the cam in their relation to each other so as to shorten up the recess 9. V Ifclaim,-

1. In a machine for making paper bags,

in combination with means for folding the j revolves wholly inside the frame of the machine, two adjustable pinch rolls movable toward and away from each other located just forward of the path of rotation of the striker arm and two bottom forming rolls which engage the severed bag blank ust us it is released by the separation of the pinch rolls. I

3. In a paper bag machine in combination with means for folding the paper into a "tube and draw rolls to feed the same, of

means to sever the paper tube into blanks, and means for holdlng the tubetaut at the time of severance comprising two pinch rolls one on top of the other. the top roll being journaled at each end in a carrying arm, a rocker shaft to which the arms are attached, a rocker arm attached to saidrocker shaft, an adjustable cam in engagement with said rocker arm to vary the period of engagement between the top and bottom rolls, a spring attached to the top pinch r011 carrying arm and to the frame, tending to pull the pinch rolls together at all times.

a. In a paperbagmachine of the type described two pinch rolls, one on top of the other, a rocker shaft, a rocker arm, carrying arms supporting the top roll, an adjustable cam which engages the rocker arm and! moves. top roll away from bottom roll at engage the severed blank just as it is released 20 a by the pinch rolls.

JAMES DUVALL.

Vitnesses:

AARON N. COHEN, W. L. FOLEY.

Goples or this patent may be obtained for five cents each, by addressing the (lommlssioner of Patents, Washington, D. G. 

